caching template question

[Wired1]

I'd like to cache a template on a "do?=extra" within a hack of mine. The template is named "page" (imaginative, I know).

Would this be the correct plugin to add into my product, or is there a more graceful way to do it?

<plugin active="1">
	<title>Caching the "page" template</title>
	<hookname>cache_templates</hookname>
	<phpcode><![CDATA[

$actiontemplates = array(
	'extra' => array(
	'page',
	)

$actiontemplates['updateextra'] =& $actiontemplates['extra'];

]]></phpcode>
</plugin>